PDF malware analysis — malicious · d623739a572fc4d6

MALICIOUS

PDF

86.0 KB Created: 2021-07-23 01:51:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: a98b9f6e509ad152d81648a1ff399935 SHA-1: f5691d2bf8591856f7ff79634ede3990d9fd7196 SHA-256: d623739a572fc4d6d36b3c7fc8fc814a52aa600ee89fd9d8fbdf4b3cf7cc37fe

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous URLs pointing to potentially compromised or disposable hosting. The heuristics indicate it functions as a link farm, likely intended to redirect users to malicious content or phishing sites. The ClamAV detection and ML classifier strongly suggest a malicious intent, consistent with phishing or malware distribution.

Machine Learning

Nyx PDF Classifier malicious score 0.9848

Heuristics 7

ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM

PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM

Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
External URI info PDF_URI

PDF contains an external URL action
Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL

The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
URL http://carefirstyoungatheartgala.com/clients/b/bc/bc61c41cf33a111e4089ebab1e34a2ce/File/xuzivunoluxigoju.pdf In PDF document text
- https://fertilizerproductionprocess.com/d/files/janafilusaz.pdfIn PDF document text
- https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/16071215dc8eac---powitab.pdfIn PDF document text
- http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c0c45244637---ruxil.pdfIn PDF document text
- https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606d35f23d2c9---sagit.pdfIn PDF document text
- https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/e47bfcc55bb0c11f6769cbd13dcd2c2d/52418514490.pdfIn PDF document text
- http://mtlebanon62.com/clients/5/5e/5ee551a8be14a26d7d76bc5e90dd1372/File/xobefezijolawusukinomiwef.pdfIn PDF document text
- http://dentherapia.hu/files/file/3853167253.pdfIn PDF document text
- https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1609f5e027ab65---95093251226.pdfIn PDF document text
- http://nhs1980alumni.com/clients/878257/File/bijijuveluposabusumiw.pdfIn PDF document text
- https://imad0c0.com/js/ckfinder/userfiles/files/28636542922.pdfIn PDF document text
- https://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/2fd5fa8a94da167f1cf4e2c580f75db9/46703497890.pdfIn PDF document text
- http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/6da388c6ad2dd89a38beb3e39c6c5d3b/19642716928.pdfIn PDF document text
- https://czus-lukasa.sk/userfiles/file/peraketak.pdfIn PDF document text
- http://taiyoaquris.cn/upload/userfiles/files/20210529193237.pdfIn PDF document text
- http://hondasushi.com/uploads/files/jawuwasisamawisulesuf.pdfIn PDF document text
- https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/5223cb4457d949c3b08406b380b35f0e/wisisefo.pdfIn PDF document text
- https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1607940ed16a7c---liropaposadevatix.pdfIn PDF document text
- http://sbs-group.co/userfiles/files/73977511258.pdfIn PDF document text
- http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160edda4017fb9---toxenu.pdfIn PDF document text
- http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160987e3d94329---26996846274.pdfIn PDF document text
- http://richmore.kr/uploadfile/fckeditor/file/96879271165.pdfIn PDF document text
- https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/v015savkebkdn0o4uf6jba428k/33006779262.pdfIn PDF document text
- http://cainghienbinhduong.com/uploads/userfiles/file/giwusaxobetu.pdfIn PDF document text
- https://hmanagement.net/userfiles/file/lotud.pdfIn PDF document text
- http://musorcentrum.hu/files/article/file/17252435163.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=tailoring+shadowlands+guidePDF link annotation
- http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
- http://purl.org/dc/elements/1.1/In PDF document text
- http://ns.adobe.com/pdf/1.3/In PDF document text
- http://ns.adobe.com/xap/1.0/In PDF document text
- http://ns.adobe.com/xap/1.0/mm/In PDF document text
- http://ns.adobe.com/xap/1.0/rights/In PDF document text
- http://dejavu.sourceforge.netIn PDF document text
- http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000ec3c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEC3C	10580 bytes
SHA-256: `6898497732a9cc42a5e432d4e7b34085d032998367c2bb69cb9eeba0ded8a619`
`font_01_sfnt_off00010426.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10426	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00011c38.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11C38	17284 bytes
SHA-256: `d8cdc8e915d115b7b92af82a553f4eec48d12d4353ae2458115340cbb9d0327b`

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